40x+30(100-x)>=3400
    140x+110(100-x)<=12800
    （20+2.5×18+0.6×18+10.4×18.1+18.6×3.4+19.7t）×0.276-2×4.5×0.525+10×（16.9+t-1）×（1-0.276）＜0
    abs(-m^2+2*m-2)
    -3<=-m^2+2*m-2<=3
    -3<=-m^2-1<=3
    1-a^2>a-1
    -1
    -1
    x*x-2*2-3<0
    9x^2-4x+4<0
    (4-k)^3*(1-k)>16
    (4-k^3)*(1-k)>16
    m^2+2m+1>0
    3x≤27
    k-4-sqrt((4-k)^2-16)<0
    (4-k)^2-16<0
    (4-k)^-16<0
    (4-k)^2-16>0
    9x＞4

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